Hello Bass
I have the same type of problem. My wrist gets sore from bowling.
But it does not have anything to do with the grip.
Have you ever had your hand checked for tendon shearing ??
Other wise know as Carpal Tunnel(spelling)
I work with computers all day and then bowl and the wrist is just a little stiff after a night of bowling.
Something you might want to look into ??
James